MeanGene1

Member
When I drug home my 350 Utility Diesel, it would start and run, but would start to heat up after about 10 minutes, and it tried to overspeed the last time it was started to move it, but shut down correctly with the cutoff. Looking it over, someone, in their wisdom, had cut the fuel lines and bypassed all three fuel filters and put a simple cheapo inline filter in the line, so I'm thinking it was running lean from the puny filter. I do have the correct filters, but have also obtained a single OEM canister filter from a 504D, like the twins on our old 706Ds but the 504D only used one. I'm thinking the 504D filter will be ok, and easy to plumb up and easier to get elements. I'm thinking the pump should come apart for inspection and cleaning, possibly repair, does anyone have good knowledge about the pump on the Continental Diesel? I would assume there was a specific manual for the Continental engine? Like to get it running, as it ran clean and sounded good, cooling system was clean, TA worked etc., but it has been sitting for a while, pump will only be worse, and I don't want to tear into the pump without more info, procedures etc. TIA
 
It has a Roosamaster pump. In my experience when an engine with one of those pumps over speeds or the throttle response is erratic it means pump tear down time. And usually it is from chunks of the governor shock ring that is disintegrating. However the break down for the pump does not show it has that design in it, number 70 in the linked diagram would be multiple parts. Secondly if you think it is over heating because it is running lean as a gas engine may do that is not a symptom of a diesel. Lack of fuel delivery to the pump, as in a filter restriction only cuts back fuel delivered to the injectors. So it is essentially the same as slowing the engine down with the throttle which tells the pump to deliver less fuel. The air to the cylinders or intake manifold is not restricted in a diesel. I would see if Dieseltech chimes in here and gives his two cents. I would recommend shipping the pump to him and have him go through it. The pump can be pulled apart and resealed by an above average mechanic, but there are so many things to look for in them that it is just best that an experienced person works on them. And they usually have a test stand to check fuel delivery and set them properly when they are done.
CNHI IH 350 utility inj. pump diagram
 
A fuel restriction will cause a Roosa Master equipped engine to have varying speeds. We used to use that as a guide to needing filters changed. This was before and after the pumps had the plastic governor dampener ring on governor weight carrier.

Also, the 350 diesel is an odd one in that it has a throttle like valve in the intake that reduces air flow at low idle to make the engine run smoother and less diesel noise. Might want to look at that to see if it is working as it could cause a lot of excess black smoke if not opening all the way.

We only had about two of those in the territory so not a whole lot of experience on them but did work on them a few times.
 
During the production time of this tractor Roosa Pumps did not use a flex ring. They had a spring loaded weight retainer. This does not mean someone hasnt installed one, but it in your best interest to have this pump looked over and made right. A continental engine is hard to get parts for. Even harder to pay for them. I would not take the chance of an over speed run away to ruin this engine. Al
 

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